48 



THE FLOWER. 



into two irregular segments, called the upper and lower lip. If 

 the lips be widely separate, they are said to be ringcnt {ringo, 

 to grin). Ex. monkey-flower.' If the up})er and lower sides are 

 pressed together, ^^j^ersowa^e {persona, a mask) ; Ex. snap dragon.; 

 If the upper lip is arched, it is termed the helmet or galea. Ex 

 Lamiura. This form of the corolla almost universally char- 

 acterizes the plants of the large and imj)ortant natural order 

 Labiatse. 



FIG. 14. — Forms of corollas; 1, Campanula rotundifolia ; 2, tobacco; 3, Convolvulus; 

 4, Veronica ; 5, sage ; 6, Gaullheria procumbens ; 7, Phlox ; 8, cabbage ; 9, rose ; 10, Lathyrus. 



105. Several forms of polypetalous corollas have also re- 

 ceived appropriate names, and are described as follows. The 

 last only is in-egular. 



1. Cruciform {crux, a cross), consisting of four petals spread- 

 ing at right angles to each other. ' Plants with this corolla con- 

 stitute the large natural order Cruciferas, which corresponds to 

 the 15th class in the artificial arrangement. Of this kind is the 

 mustard (Sinapis). 



2. Rosaceous, like the rose. A regular corolla, consisting of 

 five or more petals, spreading horizontally, attached to the 

 receptacle by very short claws. Ex. rose, apple../ 



3. Liliaceous, hke the lily. The Perianth consists(of six parts, 

 each gradually bending outv/ards in such a manner as to resem- 

 ble the campanulatc. Ex. lily, tulip (Fig. 4). 



